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3 years ago

Which describes free fall?

Physics

2 answers:

spin [16.1K]3 years ago

7 0

Answer:

Explanation:

Newtonian physics show that free fall is any motion of a body where gravity is the only force acting upon it. Hope this helps!

frosja888 [35]3 years ago

5 0

Answer:

THE CORRECT ANSWER IS D

Explanation:

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Astronomers observe a quasar and measure its spectrum. A particular spectral line has a value of 279.8 nm when measured using a

Arada [10]

Answer:

$v=-80.5*10^{6}m/s$

Explanation:

For this particular problem, we are going to use the non-relativistic Doppler effect which, is the change in frequency of a wave concerning an observer who's moving relative to the wave source. The shifted wavelength is:

$\lambda_{shifted}=\lambda_{0}\left(1+\dfrac{v}{c_{0}}\right)$ ,

where $\lambda_{0}$ is the wavelenght as it comes from the source, $v$ is the velocity of the source (the quasar) and, $c_{0}$ is the velocity of the wave. In this case, the velocity of the wave is the speed of light, $c_{0}=c=3*10^{8}\ m/s$ .

Solving for $v$ ,

$v=c\left(\dfrac{\lambda_{shifted}}{\lambda_{0}}-1\right)$ ,

now computing

$v=3*10^{8}\left(\dfrac{279.8*10^{-9}}{382.5*10^{-9}}-1\right)$ ,

$v=-80.5*10^{6}m/s$

The velocity of the quasar is negative because it is getting close to the Earth!

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